It is an Al Mg Si alloy with medium strength, good plasticity and corrosion resistance. In particular, it has no tendency of stress corrosion cracking, good weldability, corrosion resistance and cold workability. It is a kind of alloy with a wide range of application and a very promising future. It can be anodized or painted with enamel, which is suitable for building decoration materials. It contains a small amount of Cu, so its strength is higher than 6063, but its quenching sensitivity is also higher than 6063. After extrusion, air quenching cannot be realized, so it needs to be re solution treated and quenched for aging to obtain higher strength.